NSF International Research Fellowship Program: A Direct Measurement of the Neutron-Neutron Scattering Length at YAGUAR

[107263]斯蒂芬森国际研究员奖励计划使美国科学家和工程师能够到国外进行3至24个月的研究。该计划的奖励为联合研究提供了机会，并利用独特或互补的设施、专业知识和国外的实验条件。该奖项将为葛底斯堡学院的Sharon L. Stephenson博士提供6个月的支持，与俄罗斯杜布纳核物理联合研究所的edward I. Sharapov博士一起直接测量YAGUAR的中子-中子散射长度。该项目由美俄合作研究计划和MPS多学科活动理事会办公室共同资助。对中子-中子散射长度的直接测量从未进行过。所需要的是中子通量的高瞬时值和对系统误差的仔细注意。相对较新的YAGUAR脉冲反应堆具有必要的瞬时通量。解决系统错误的一种方法是建模。PI将使用蒙特卡罗n粒子（MCNP）传输代码来模拟俄罗斯Snezhinsk的YAGUAR脉冲反应堆。她将帮助设计和执行第一代和第二代实验；第一种方法的中子-中子散射长度精度为3%，第二种方法的精度为1%。莎拉波夫是联合研究所的核物理学教授。他是核结构方面的权威，最著名的是在20世纪80年代早期领导了镧宇称破坏实验。

0107263StephensonThe International Research Fellow Awards Program enables U.S. scientists and engineers to conduct three to twenty-four months of research abroad. The program's awards provide opportunities for joint research, and the use of unique or complementary facilities, expertise and experimental conditions abroad.This award will provide 6 months of support to Dr. Sharon L. Stephenson of Gettysburg College to work with Dr. Eduard I. Sharapov at the Joint Institute of Nuclear Physics in Dubna, Russia on a direct measurement of the neutron-neutron scattering length at YAGUAR. This project is being co-funded by the U.S.-Russia Cooperative Research Program and the MPS Directorate's Office of Multidisciplinary Activities.A direct measurement of the neutron-neutron scattering length has never been done. What is needed is a high instantaneous value for the neutron flux and a careful attention to systematic errors. The relatively new YAGUAR pulsed reactor has the necessary instantaneous flux. One way to address systematic errors is by modeling. The PI will use the Monte Carlo N-Particle (MCNP) transport code to model the YAGUAR pulsed reactor in Snezhinsk, Russia. She will help design and perform a first and second generation experiment; the first will achieve an accuracy in the neutron-neutron scattering length ann of 3% and the second 1%.Dr. Sharapov is a professor of nuclear physics at the Joint Institute. He is an authority on nuclear structure and is best known for leading the lanthanum parity violation experiment in the early 1980's.